12101100000021 has 12 divisors (see below), whose sum is σ = 17481392902272. Its totient is φ = 8066464814376.

The previous prime is 12101099999993. The next prime is 12101100000047. The reversal of 12101100000021 is 12000000110121.

It is a happy number.

It is not a de Polignac number, because 12101100000021 - 2⁶ = 12101099999957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 12101099999949 and 12101100000012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12101100080021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77850181 + ... + 78005466.

It is an arithmetic number, because the mean of its divisors is an integer number (1456782741856).

Almost surely, 2^{12101100000021} is an apocalyptic number.

It is an amenable number.

12101100000021 is a deficient number, since it is larger than the sum of its proper divisors (5380292902251).

12101100000021 is a wasteful number, since it uses less digits than its factorization.

12101100000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155864280 (or 155864277 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 12101100000021 its reverse (12000000110121), we get a palindrome (24101100110142).

The spelling of 12101100000021 in words is "twelve trillion, one hundred one billion, one hundred million, twenty-one", and thus it is an aban number.